EN ISO 19906:2019

SLOVENSKI STANDARD
01-november-2019
Nadomešča:
SIST EN ISO 19906:2012
Industrija nafte in zemeljskega plina - Naftne ploščadi za arktična območja (ISO
19906:2019)
Petroleum and natural gas industries - Arctic offshore structures (ISO 19906:2019)
Erdöl- und Erdgasindustrie - Offshore-Bauwerke für den Arktis-Bereich (ISO 19906:2019)
Industries du pétrole et du gaz naturel - Structures arctiques en mer (ISO 19906:2019)
Ta slovenski standard je istoveten z: EN ISO 19906:2019
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19906
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2019
EUROPÄISCHE NORM
ICS 75.180.10 Supersedes EN ISO 19906:2010
English Version
Petroleum and natural gas industries - Arctic offshore
structures (ISO 19906:2019)
Industries du pétrole et du gaz naturel - Structures Erdöl- und Erdgasindustrie - Offshore-Bauwerke für
arctiques en mer (ISO 19906:2019) den Arktis-Bereich (ISO 19906:2019)
This European Standard was approved by CEN on 21 April 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19906:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19906:2019) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum, petrochemical and natural gas industries" in
collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for
petroleum, petrochemical and natural gas industries” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by February 2020, and conflicting national standards
shall be withdrawn at the latest by February 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 19906:2010.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 19906:2019 has been approved by CEN as EN ISO 19906:2019 without any modification.

INTERNATIONAL ISO
STANDARD 19906
Second edition
2019-07
Petroleum and natural gas
industries — Arctic offshore
structures
Industries du pétrole et du gaz naturel — Structures arctiques en mer
Reference number
ISO 19906:2019(E)
©
ISO 2019
ISO 19906:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
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Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 19906:2019(E)
Contents Page
Foreword . x
Introduction . xi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 10
4.1 Symbols . 10
4.2 Abbreviated terms . 10
5 General requirements and conditions . 12
5.1 Fundamental requirements . 12
5.2 Design methods . 12
5.3 Site-specific considerations . 13
5.4 Construction, transportation and installation . 15
5.5 Operational measures . 16
5.6 Environmental protection . 16
5.7 Serviceability requirements including vibration . 17
5.8 Decommissioning and reclamation . 17
6 Physical environmental conditions . 17
6.1 General . 17
6.1.1   Physical environment requirements . 17
6.1.2   Physical environmental data monitoring programmes . 18
6.2 Daylight hours . 18
6.3 Meteorology . 18
6.3.1   Air temperature . 18
6.3.2   Wind . 19
6.3.3   Wind chill . 19
6.3.4   Snow . 19
6.3.5   Ice accretion . 19
6.3.6   Visibility . 20
6.3.7   Polar lows . 20
6.4 Oceanography . 20
6.4.1   Water depth . 20
6.4.2   Waves . 20
6.4.3   Ocean currents . 20
6.4.4   Other oceanographic factors . 21
6.5 Sea ice and icebergs . 21
6.5.1   General . 21
6.5.2   Ice types . 22
6.5.3   Ice morphology . 22
6.5.4   Ice movement . 22
6.5.5   Ice properties . 23
6.5.6   Ice monitoring . 23
6.6 Seabed considerations . 23
6.6.1   Earthquakes . 23
6.6.2   Permafrost . 23
6.6.3   Ice gouge . 23
6.6.4   Strudel scours . 23
7 Reliability and limit states design . 24
7.1 Design philosophy . 24
7.1.1   Governing principles . 24
7.1.2   Life-safety categories . 24
ISO 19906:2019(E)
7.1.3   Consequence categories . 24
7.1.4   Exposure levels . 25
7.1.5   Safety and reliability . 25
7.1.6   Limit states . 25
7.1.7   Alternative design methods . 25
7.2 Limit states design method . 26
7.2.1   Limit states . 26
7.2.2   Actions . 28
7.2.3   Principal and companion environmental actions . 29
7.2.4   Combinations of actions and partial action factors . 31
8 Events and actions . 33
8.1 General . 33
8.2 Ice events and actions . 33
8.2.1   General principles for calculating ice actions . 33
8.2.2   Representative values of ice actions . 34
8.2.3   Ice events and design situations . 34
8.2.4   Global ice actions . 35
8.2.5   Local ice actions. 37
8.2.6   Dynamic ice actions . 37
8.2.7   Operational measures to reduce ice actions . 38
8.2.8   Physical and mechanical properties of ice . 38
8.3 Metocean related actions . 39
8.3.1   Metocean actions on structures . 39
8.3.2   Wave-induced velocity of ice features . 41
8.4 Seismic actions . 41
8.4.1   General . 41
8.4.2   Companion seismic actions . 42
8.4.3   Companion ice actions . 42
8.4.4   Factors influencing seismic actions and effects . 42
8.4.5   Seismic isolation and damping systems . 42
9 Foundation design . 42
9.1 General . 42
9.2 Geotechnical data acquisition and identification of hazards . 43
9.2.1   General . 43
9.2.2   Marine soil investigations . 44
9.2.3   Bathymetry survey . 44
9.2.4   Geophysical survey . 44
9.3 Representative values of soil properties . 44
9.4 Design considerations . 45
9.4.1   General . 45
9.4.2   Action factors . 46
9.4.3   Material and resistance factors . 46
9.4.4   Dynamic action effect analysis . 46
9.4.5   Ultimate limit states . 46
9.4.6   Serviceability limit states . 47
9.4.7   Fatigue limit states . 47
9.4.8   Abnormal limit states . 47
9.4.9   Construction and installation . 47
9.5 Gravity-based structures . 48
9.5.1   Arctic considerations for foundation design . 48
9.5.2   Installation and removal . 48
9.6 Piled structures . 49
9.7 Design of anchors for floating systems . 49
9.7.1   General . 49
iv © ISO 2019 – All rights reserved

ISO 19906:2019(E)
9.7.2   Drag anchors . 49
9.7.3   Suction anchors . 50
9.7.4   Piled anchors . 51
9.7.5   Removal . 51
9.8    Scour . 51
9.9    Inspection and performance monitoring . 51
9.10   Seismic analysis . 52
10 Man-made islands . 52
10.1   General . 52
10.2   Island types . 52
10.3   Design considerations . 53
10.3.1  General design considerations . 53
10.3.2  Considerations for man-made islands . 54
10.3.3  Design for ice . 55
10.3.4  Geotechnical considerations . 56
10.3.5  Coastal engineering . 58
10.3.6  Slope protection . 59
10.4   Seismic design . 60
10.5   Construction . 61
10.5.1  Operational requirements . 61
10.5.2  Fill quality control . 61
10.5.3  Armour rock quality control . 62
10.6   Monitoring and maintenance . 62
10.6.1  General . 62
10.6.2  Monitoring of the physical environment . 62
10.6.3  Structural monitoring . 63
10.6.4  Slope and slope-protection monitoring . 63
10.6.5  Maintenance . 63
10.7   Decommissioning and reclamation . 63
11 Fixed steel structures . 64
11.1   General . 64
11.2   General design requirements . 64
11.2.1  Plastic design . 64
11.2.2  Resistance factors . 64
11.2.3  Fracture control . 64
11.2.4  Temperature effects . 65
11.2.5  Damage due to freezing water . 65
11.3   Structural modelling and analysis . 65
11.3.1  General . 65
11.3.2  Interactions . 65
11.3.3  Dynamic analysis . 65
11.4   Strength of tubular members and joints . 65
11.5   Strength of stiffened-plate panels. 66
11.6   Strength of steel-concrete composite walls . 66
11.6.1  General . 66
11.6.2  Analysis methods . 67
11.6.3  Material properties . 67
11.6.4  Design for out-of-plane actions . 67
11.6.5  Design for in-plane actions . 68
11.7   Seismic design . 69
11.7.1  Framed structures . 69
11.7.2  Stiffened-plate structures . 69
11.8   Fatigue . 69
11.9   Materials, testing and NDT . 69
ISO 19906:2019(E)
11.9.1  Material selection . 69
11.9.2  Test temperature . 70
11.9.3  Toughness and NDT . 70
11.10   Coatings . 70
11.11   Corrosion and abrasion protection . 70
11.11.1  Cathodic protection . 70
11.11.2  Ice abrasion . 70
11.11.3  Knife-line corrosion . 70
11.12   Welding . 70
12 Fixed concrete structures . 71
12.1   General requirements . 71
12.1.1  General . 71
12.1.2  Structural requirements . 71
12.1.3  Material requirements . 71
12.2   Actions and action effects . 71
12.3   Structural analysis . 72
12.3.1  Dynamic analysis . 72
12.3.2  Loss of intended internal pressure . 72
12.3.3  Physical representation . 72
12.3.4  Types of analysis . 73
12.3.5  Analysis requirements . 73
12.3.6  Seismic design . 74
12.4   Concrete works. 74
12.4.1  Design. 74
12.4.2  Materials . 77
12.4.3  Execution . 80
12.5   Mechanical systems . 81
12.5.1  Introduction . 81
12.5.2  Permanent mechanical systems . 82
12.5.3  Mechanical systems — Temporary ballasting/deballasting water systems . 82
12.5.4  Attachments and penetrations . 82
12.5.5  Mechanical systems — Design of piping supports . 82
12.6   Marine operations and construction afloat . 82
12.7   Corrosion control . 83
12.8   Inspection and condition monitoring . 83
13 Floating systems . 83
13.1   General . 83
13.2   General methodology . 84
13.2.1  Design and operational philosophy . 84
13.2.2  Design and operational approaches . 84
13.2.3  System considerations . 85
13.2.4  Ice alert system . 85
13.3   Environment . 85
13.4   Actions . 86
13.4.1  Applicability . 86
13.4.2  Ice scenarios . 86
13.4.3  System-specific ice actions . 87
13.4.4  Determination of global ice action effects. 88
13.4.5  Risk to adjacent structures . 89
13.4.6  Other ice action considerations . 89
13.4.7  Action variations . 90
13.5   Hull integrity . 90
13.5.1  Structural philosophy . 90
13.5.2  Hull ductility . 91
vi © ISO 2019 – All rights reserved

ISO 19906:2019(E)
13.5.3  Structural analysis and design . 91
13.5.4  Structural considerations . 91
13.5.5  Condition monitoring . 92
13.6   Hull stability. 92
13.6.1  General considerations . 92
13.6.2  Subdivision . 92
13.6.3  Intact stability . 92
13.6.4  Damaged stability . 92
13.7   Stationkeeping . 93
13.7.1  General . 93
13.7.2  Design of the stationkeeping system. 93
13.7.3  Disconnection and reconnection . 93
13.7.4  Stationkeeping system failures . 96
13.8   Mechanical systems . 96
13.8.1  General considerations . 96
13.8.2  Hull systems . 98
13.8.3  Offloading systems . 100
13.9   Operations . 100
13.9.1  General . 100
13.9.2  Operations and emergency procedures manuals . 100
13.9.3  Deck surfaces . 101
13.9.4  Damage control . 101
13.9.5  Equipment and doors . 101
13.9.6  Inspection and maintenance . 101
13.9.7  Planning and operations . 102
14 Subsea production systems . 102
14.1   General . 102
14.1.1  System components . 102
14.1.2  Exposure level for system components . 102
14.1.3  General provisions for ice actions . 102
14.1.4  Repair . 102
14.2   Ice and seabed considerations . 103
14.2.1  Interactions above the sea floor . 103
14.2.2  Interactions for gouging ice features . 103
14.2.3  Strudel scouring . 103
14.2.4  Permafrost . 104
14.2.5  Geohazards . 104
14.3  Actions on subsea production systems . 104
14.3.1  General action requirements . 104
14.3.2  Ice protection structures . 104
14.3.3  Mudline cellars . 105
14.3.4  Risers and loading/unloading systems . 105
14.3.5  Flowlines and umbilicals . 106
14.3.6  Resistance to ice actions . 107
14.4   Seismic design . 107
14.5   Risk reduction . 107
15 Topsides .
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